Switch



,May 5, 1925. 1,536,953

M. c. WATERS SWITCH Filed April 22, 1921 M 6. Waff/z5'.

Sme/wim L Patented May 5:,

UNITED STATES PATENToFFlcE.

MARION c. WATERS, or naooxrIELD, MISSOURI.

l Y swrron.

Application ined April 22, 1921.

To all 'whom t may concern.

Be it known that I, MARION C. WATERS, a citizen of the United States, residing at Brooklield, in the countyof Linn and State of Missouri, have invented certain new and useful Improvements in Switches, of which the following is a specification.

This invention relates to an improved switch p-articularly designed for use in connection with motor vehicle transmissions and seeks to provide a device which maybe readily attached to a transmission gear case and wherein, when the reverse gear of the transmission is shifted to active position, the switch will be closed.

Other and incidental objects will appear hereinafter.

In the accompanying drawings:

Figure 1 is a sectional view showing my improved switch attached to the gear case of a conventional transmission.

Figure 2 is a side elevation illustrating a slight modification of the invention. 1

Referring now more particularly to the drawings, I have, for convenience, shown my improved switch in connection with a conventional transmission including a gear case v 11. One of the shifter rods of the transmission is indicated at 13, and one of the shifter T forks at l14, the fork being movable rearwaidly along the rod for shifting the reverse gear-of the transmission to actlve position.

In carrying the invention into effect, I employ a tubular switch casing 18 which, as shown inFigure 2, is threaded at one end through the rear end wall of the gear case 11. This casingis preferably formed of metal and slidable therein is a plunger 19 having a body snugly but freely fitting within the casing. Projecting from one end of the plunger body axially thereof is a switch contact rod 20 and projecting from the plunger body at its opposite end is a somewhat shorter rod 21 alining with the rod 20 and extending forwardly into the gear case 11 in the path of rearward movement of the shifter fork 14. Threaded into f the ihner end of theswitch casing closure plug 22 slidably receiving the rod 21 of the plunger therethrough` and threaded into the casing at its outer end is a cupped dielectric closure plug 23. Bearing between the plug 23 and the body of the lunger is a spring 24 normally holding tlie Klum er body retracted in engagement with t e u 22. Extending through the plugv 23 axially isa Serial .Nm 463,442.

post to confront the nut 26 is a'bindingnut 28. As suggested in the drawings, a circuit wire, as conventionally illustrated at 31, is connected to the binding post 25.

As will now be readily understood in view of the preceding descri tion, when the shifter fork 14 1s moved) rearwardly for shifting the reverse gear of the transmission to active position, said fork will engage the rod 21 of the plunger 19 and move the plunger within the switch casing 18 to engage the switch contact rod 2O between the switch fingers 27 for closing the switch. On the other hand, when the shifter fork 14 is then subsequently moved forwardly for shifting the'reverse gear of the transmission to neutral position, as shown in Figure 2, the plunger 19 will be freed. Accordingly, the spring 24 will act to immediately retract the plunger and open the switch.

In Figure 2 of the drawings, I have illustrated a slight modification of the invention. ransmissions of some designs employ longitudinally movable shifter rods instead of stationary rods and movable shifter forks, as illustrated in connection with the pre` ferred construction. The modification of Figure 2 is accordingly designed to adapt the `device for use in connection with a gear set wherein the shifter rods themselves are movable. InFigure 2, a conventional gear case is indicated at 32 and one of the shifter rods at 33, this rod being movable rearwardly through the gear case for. shifting the reverse gear of the gear set to active position. Bolted or otherwise secured at one end to the rear end wall of the gear case is a bracket 34 provided at its o posite end with an eye 35. The casing 18 of) the switch, as illustrated in connection with the reerred construction, is free'ly received through said eye and threaded upon the inner end portion of said casing to confront opposite sides of the eye are nuts 36 securing the casing upon the bracket. The bracket is provided with relatively offset end portions and, as will be observed, is

g tiomthat when the rod 33 is shifted rearwardly for-moving the reverse gear of the explained.

gear set to active position, said rod will engage the rod 2l of the switch plunger for closing the circuit in the manner previously Otherwise, this modification of the invention is identical with the preferred construction and further description is accordingly deemed unnecessary.

Having thus describedthe invention, what is claimed as new is:

ln a device of the character described, the combination of an outer tubular switch cas` ing, ya tubular insulating plug closed at one end and removably engaged in one end of the casing closing the casing at said end thereof, a switch member mounted upon the closed end of said plug and housed within the lines thereof, a closure plug removably engaged in the opposite end of the casing, a plunger conforming to'the internal diameter of the casing and slidable in said casing, the plunger being provided at one end with a reduced plunger rod projecting freely through the latter plug and at its opposite end with a reduced alined Contact rod to cooperate with Said switch member, and a spring bearing between the inner end of said first mentioned plug and the plunger normally holding the plunger retracted.

In testimony whereof I aiix my signature.

MARION C. TATERS. [1.. s] 

